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that will be fine the seasonic is best in its class
be warned server form factor psu's are quite basic looking and equipped but that are built to stricter standards then most psu's
seasonic makes the ax 650-850 and tx 650/hx650 and the newer txV2's for corsair
cwt makes the txm and the older tx 550,750.850,950 and hx 1000/1050 hx 750,hx850 for corsair
and yes the 620 is pretty decent no reason to return it
you'll be fine thyat dell psu is likely a delta or a server grade psu which will be fine for sli 560's
delta makes some of the best antec have to offer
well there are a few that come to mind
from antec we have the
hcp 1200 and sg 850
corsair
the hx850
seasonic
m750d and m850d(used in the xfx 750 and 850 modular series)
860 plat
1000 plat(also used in the xfx 1000 plat)
zippy emacs
atx 850(if the world ends and all power supplies...
because its beyond mediocre with false advertising and will die with the magic smoke before it even gathers dust
jonnyguru helped them with the x3 range and those were the best ultra ever had to offer
if you want the best 1000 watt value gold rated unit that is infinitely better get the...